Kara, Orhan, Fathollah Bagheri, and Thomas Tolin. “Factors Affecting Students Grades In Principles Of Economics”. American Journal of Business Education (AJBE) 2, no. 7 (October 1, 2009): 25–34. Accessed July 17, 2024. https://clutejournals.com/index.php/AJBE/article/view/4581.